Process of filtering viscose and similar viscous substances.



No. 876,901. PATENTED JAN. 14, 1908. O. A. ERNST 85. G. O. HAMLIN. PROCESS OF FILTERING VISGOSE AND SIMILAR VISOOUS SUBSTANCES.

' APPLIOATION FILED MAY 11, 1907.

All,

mum UH:

WITNESSES CHARLES A. ERNST AND GEORGE O. HAMLIN, OF LANSDOWNEPENNSYLVANIA, ASSIGNORS TO SILAS W. PETTIT, OF PHILADELPHIA, PENNSYLVANIA.

PROCESS OF FILTERING VISCOSE AND SIIMILAR VISCOUS' SUBSTANCES.

Specification of Letters Patent.

Patented 38.11.14, 19039 I Original application filed April 24. 1905. Serial No- 257.l00. Divided and this application filed May 11. 1907. Serial No. 373031.

To all whom it may concern."

Be it known that we, CHARLES A. ERNST and GEORGE O. HAMLIN, both of Lansdowne,

county of Delaware, State of Pennsylvania, have invented certain new and useful Improvements-in the Process of Filtering Viscose and Similar Viscous. Substances, of which the following isa full, clear, and complete disclosure, this application being a division of our application for United States patent, filed .'April 24, 1905, Serial No. 257,100. i Y

The object of our invention is to quickly and efiiciently remove plastic, gelatinous, or other impurities from viscose and other viscous substances.

g In ordinary filters in which cloth, cotton, cotton wool, or glass wool is packed in the ordinary manner, the plastic or gelatinous impurities are contorted or compressed to such an extent that they are squeezed through the pores of interstices between the fibers of the filtering material although such pores or interstices maybe smaller in diameter than the normal size of the impurities. We have found this to be the casewith gelatinous (particles contained in viscose, made accor i present time, and particularly in accordance with U. S. Patent, No. 716,778, issued December 23, 1902, to Charles H. Sterns. We have found that by compressingthe filtering material so that the pores 'or inter-. stices between fibers of the same are made said fibers more firmly and definitely 100 of the filtering material, which is done by subjecting the filtering material to external pressure, the gelatinous vented from" moving 0 fibers of the filterin material, as is the case when said materia is not under external pressure, that is, not'underpressure greater.

measure, have a tendency to float in. the

viscose, and thus be not firmly located so as to interrupt the passage of the gelatinous articles therethrough. According to our lnvention, however, the external pressure fixes the spaces or pores between the fibers of ng to the methods known at the having a series of meshes therein, and also vent the filtering material from passing Iparticles are predislocating the the filter material so that said fibers are not pushed aside to allow the passage of the impurities, and the spaces between said fibers are maintained in much more constantand fixed diameter than heretofore, said pores also being considerably more reduced in diameter than when not subjected to external pressure.

For a full, clear, and exact description of one form of apparatus for carrying out our 65, improved. process, reference may be had to the following specification, and to the accom-' panying-drawmg forming a part thereof, in which Figure 1 is a plan view of one form of'a suitable filter; and'Fig. 2 is a transverse sectional view thereof.

Referrin to the drawings, the numeral 1 indicates the upper plate or casing of the filter, and the numeral 2' the lower plate or casing thereof. These plates are provided on their inner faces with shallow circular recesses,.as indicated at 3 and 4:, which recesses communicate respectively with inlet and outlet pipes 5 and 6 respectively, laced at any. convenient point, but referab y at the center of the plates. A jacent the surface of the recess-3, we place a pieceof wire gauze, or other suitable stiif woven material, 7,

von the surface of the recess 4, a similar piece of wire gauze is indicated at 8. Upon the wire gauze 8,. we preferabl place a piece of cloth 9, which is sufiicient y meshed to pretherethrough, and for. allowin the viscose to easily pass. Between this 0 0th 9 and the upper gauze 7, we place-the filtering material, as indicated at 10, said filtering material consisting of any suitable substance, such as as cotton or glass wool, and oneform of material which we have found ,to be successful is surgeons cotton. This filtering material 10 is placed not onl within the-recesses, but extends outward y between the flanges formed 10o bp said recesses, as indicated at'll. This fi tering material, before the same is compressed, is placed in position to a depth or thickness of approximately three inches, and pressure is. then put upon thesame, so that. we the filtering material will be under a pressure greater than that to which the viscose is subjected, the pressure being somewhat varied according to the circumstances and condition of the viscose. As means for producing this pressure, we provide any well-known clamping devices, in this instance indicated as bolts 12, passing through the flanges formed by the recesses 3 and 4, at suitable intervals. It will'now be noticed that when the filtering material is clamped between the flanges, as

w ell as between the recesses in the plates, considerably more pressure is brought upon ,the filtering material between said flanges, thereby forming a packing which prevents the viscose, or material to be filtered, from passing laterally out of' the filter, "for, of course,v the material being filtered takes the lines of least resistance, in passing through the filter, and, therefore, remains in the filtering material under less pressure. It will be noticed that the plates of gauze, 7 and 8,

provide s aces .orpassages by which the vis cose or ot er material to be filtered may pass over the entire upper surface ofthe filtering material and may be withdrawn from theentire loWer surface thereof, thus causin the filter to act uniformly and evenly throug out its entire body. Instead of the use of wire gauze as indicated by the numerals 7 and 8, plates of' corrugated sheet metal, provided with openings and narrow channels or grooves arranged either radially or circularly,

' maybe used, but such grooves must necessarily be narrow in order to prevent cotton from'bemg pressed into them and thus obstructing the free passage laterally of the viscose.

- It will be e'i'iderit that the thickness of the filtering material or cotton may be varied according to the different requirements, and

also thatthe depth of the recesses in the plates 1 and 2 may also be varied to suit the re uirements of pressure offiltration required.

aving thus described our invention, it will be obvious that changes may be made in the form, arran ement and proportion of the apparatus wit out departing from the spirit and scope of our invention, since the process'may "e carried out in a variety of ways depending to some extent upon the difierent kinds of material to be filtered.

forcing the same, under pressure, through a -filtering body which is subjected to a mechanical pressure independent of and greater than thatto which the material being filtered is subjected.

3. The method of filtering viscose and similar viscous substances, which consists in forcing the substance being filtered through a fibrous filtering body,-suc'h filtering body being subjected to a pressure independentof and greater than that to which the material being 'ltered is subjected.

4. The method of filtering viscose and similar v iscous substances, which consists in forcing the fibers of a fibrous filtering body into close contact with each other and holding the fibers substantially immovable with respect to each other, by subjecting the said filtering body to external ressure and then forcing the viscosethroug said body under )ressureless than that to which the filtering ody is subjected.

In witness whereof we have hereunto set our hands this tenth day of May, 1907.

' CHARLESA. ERNST.

GEORGE O. HAMLIN. Witnesses:

ALs'roN B. MOULTON, ALEXANDER PARK. 

